The Department of Infrastructure says 10 buses face cancellation today.
Services between Douglas and Peel, Niarbyl, Willaston, Ballchrink and Farmhill could all be affected.
Bus Vannin says the affected routes are facing problems from just after 2pm until just after 11pm tonight.
It's after more than a month of problems caused by short staffing and sickness.
Vampire show featuring Manx ferry cancelled
Did chief minister's message spark fuel panic-buying?
Joe Locke lands purr-fect new role!
Steam Packet fuel surcharge isn't about profit, says chief minister
Ferry crossing delayed by half an hour
Paw-some rescue effort after Milo gets trapped in ravine
New laws for young workers come into force today
Manx Care extends mental health service to more surgeries